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We previously reported that extracellular histones are major mediators of death in sepsis. Infusion of extracellular histones leads to increased cytokine levels. Histones activate TLR2 and TLR4 in a process that is enhanced by binding to DNA. Activation of TLR4 is responsible for the histone-dependent increase in cytokine levels. To study the impact of histone release on pathology we used two models: a Con A-triggered activation of T cells to mimic sterile inflammation, and acetaminophen to model drug-induced tissue toxicity. Histones were released in both models and anti-histone Abs were protective. TLR2- or TLR4-null mice were also protected. These studies imply that histone release contributes to death in inflammatory injury and in chemical-induced cellular injury, both of which are mediated in part through the TLRs.

Extracellular Histones Are Mediators of Death through TLR2 and TLR4 in Mouse Fatal Liver Injury